1867.] On the Antiquities of Bdcjerhdt. 135 



inference that the swell of the sea was not the cause of the sounds, 

 and it is possible that they may be due to some subterranean or 

 volcanic agency, the nature of which we have not the means now to 

 ascertain. It is one, however, which is well worthy the attention of 

 scientific men. 



APPENDICES. 

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